Automatic transmission of hybrid vehicle

ABSTRACT

An exemplary automatic transmission of a hybrid vehicle according to an embodiment of the present invention includes a flywheel connected to an engine, a generator having a stator part and a rotor part, an input shaft connected with the rotor part, a hub coupled to an end of the input shaft, and a torsional damper connecting the flywheel with the hub, wherein the torsional damper includes a torsional spring and a plate, an end of the stator part is projected further toward the engine than an end of the rotor part and forms a projected portion, a vacant space is formed inside the projected portion, the plate is formed to be bent such that a mounting part mounted to the torsional spring is nearer to the generator than a mounting part mounted to the flywheel, and at least a part of the torsional spring is disposed in the vacant part.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2005-0123099 filed in the Korean IntellectualProperty Office on Dec. 14, 2005, the entire contents of which areincorporated herein by reference.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to an automatic transmission of a hybridvehicle for reducing a length of the transmission by bending a part of atorsional damper such that at least a part of the torsional damper isdisposed in a vacant space formed inside of a projected portion of astator part of the generator.

(b) Description of the Related Art

In a general hybrid vehicle, an engine and a drive motor for generatingpower for driving and a generator for generating electrical energy forcharging a battery are provided.

A driving torque generated by the engine is delivered to an input shaftof a transmission through a flywheel. Here, the flywheel and the inputshaft are connected by a torsional damper and a hub of the input shaft.

Therefore, the flywheel is disposed at one side (near the engine) of thetorsional damper, and the generator is disposed at an opposite side tothe flywheel.

To dispose the torsional damper between the flywheel and the generator,space should be allocated. Therefore, it is very difficult to shortenthe longitudinal length of the transmission along the input shaft due tothe space for disposing the torsional damper.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the invention andtherefore it may contain information that does not form the prior artthat is already known in this country to a person of ordinary skill inthe art.

SUMMARY OF THE INVENTION

The present invention has been made in an effort to provide an automatictransmission of a hybrid vehicle having advantages of shortening alength of the transmission by bending a part of a torsional damper, anddisposing at least a part of the torsional damper at a vacant spaceformed inside of a projected portion of a stator part of the generator.

An exemplary automatic transmission of a hybrid vehicle according to anembodiment of the present invention includes a flywheel connected to anengine, a generator having a stator part and a rotor part installedinside of the stator part, an input shaft connected with the rotor partof the generator, a hub coupled to an end of the input shaft, and atorsional damper connecting the flywheel with the hub, wherein, thetorsional damper includes a torsional spring mounted to the hub and aplate mounted to the torsional spring and the flywheel, an end of thestator part is projected further toward the engine than an end of therotor part and forms a projected portion, a vacant space is formedinside the projected portion, the plate is formed to be bent such that amounting part mounted to the torsional spring is nearer to the generatorthan a mounting part mounted to the flywheel, and at least a part of thetorsional spring is disposed in the vacant space.

The plate may include a first perpendicular part that is perpendicularto the input shaft and is mounted to the flywheel, a secondperpendicular part which is perpendicular to the input shaft and ismounted to the torsional spring, and a slope part connecting the firstperpendicular part with the second perpendicular part, wherein the firstperpendicular part is nearer to the engine than the second perpendicularpart.

The automatic transmission of a hybrid vehicle may further include afirst delivery shaft parallel with the input shaft, and a seconddelivery shaft parallel with the first delivery shaft and directlyconnected with a differential gear, wherein a rotational torque of theinput shaft may be delivered to the differential gear through the firstdelivery shaft and the second delivery shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of an automatic transmission of ahybrid vehicle according to an exemplary embodiment of the presentinvention.

Description of Reference Numerals Indicating Primary Elements in theDrawings 10: planetary gear set  20: differential gear 10:

 20:

100: generator 110: stator part (stator) 110a: projected portion 120:rotor part 200: torsional damper 210: plate 211: first perpendicularportion 212: slope portion 213: second perpendicular portion 220:torsional spring 300: hub 400: input shaft 500: engine 600: empty space700: flywheel 800: drive motor 910: first mounting part 920: secondmounting part

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT

An exemplary embodiment of the present invention will hereinafter bedescribed in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of an automatic transmission of ahybrid vehicle according to an exemplary embodiment of the presentinvention.

Referring to FIG. 1, an engine 500 and a drive motor 800 for generatingpower for driving and a generator 100 for generating electrical energyfor charging a battery are provided in a hybrid vehicle according to theexemplary embodiment of the present invention.

The engine 500 is connected to a flywheel 700 so as to deliver power,and the flywheel 700 is connected to a hub 300 of an input shaft 400through a torsional damper 200.

The input shaft 400 is connected with a first delivery shaft through aplanetary gear set 10, and the first delivery shaft is connected with asecond delivery shaft through gears fixedly coupled to the respectiveshafts.

A differential gear 20 is fixedly coupled to the second delivery shaft.

Therefore, when the vehicle runs, a driving torque generated by theengine 500 is delivered to the input shaft 400 through the flywheel 700,and a driving torque of the input shaft 400 is delivered to thedifferential gear 20 through the torsional damper 200 and the hub 300.

The input shaft 400 is connected with the generator 100. Therefore, whengenerating, a driving torque generated by the engine 500 is delivered tothe input shaft 400 of an automatic transmission through the flywheel700, the torsional damper 200, and the hub 300 of the input shaft 400,and then, a driving torque of the input shaft 400 operates the generator100.

The generator 100 includes a stator part 110 and a rotor part 120provided inside of the stator part 110. Here, an end-of the stator part110 is projected further toward the flywheel 700 than an end of therotor part 120.Reference numeral 110 a indicates a projected portion 110a which is the projected portion of the stator part 110.

Therefore, near the center of the projected portion 110 a of the statorpart 110 and an outer part of the rotor part 120, a vacant space 120 isallocated. The stator part 110 contains a stator coil.

The torsional damper 200 connects a flywheel 700 with a hub 300 of theinput shaft 400 of the transmission. Therefore, the flywheel 700 isdisposed at one side of the torsional damper 200 toward the engine 500,and the generator 100 is disposed at the opposite side of the torsionaldamper 200.

The torsional damper 200 includes a plate 210 mounted to the flywheel700, and a torsional spring 220 disposed between the plate 210 and thehub 300.

The plate 210 includes a first perpendicular part 211 that isperpendicularly disposed to the input shaft 400 and is mounted to theflywheel 700, a second perpendicular part 213 that is perpendicularlydisposed to the input shaft 400 and is mounted to the torsional spring220, and a slope part 212 connecting the first perpendicular part 211with the second perpendicular part 213. Therefore, the plate 210 has adouble-bent shape with the first perpendicular part 211 near the engine500 and the second perpendicular part 213 near the generator 100.

Hereinafter, a mounting part of the plate 210 and the flywheel 700 iscalled as a first mounting part 910, and a mounting part of the plate210 and the torsional spring 220 is called as a second mounting part920. The first mounting part 910 is relatively nearer to the engine 700than the second mounting part 920, and the second mounting part 920 isrelatively nearer to the generator 100 than the first mounting part 910.Here, since mounting structures of the first mounting part 910 and thesecond mounting part 920 are obvious for a person of an ordinary skillin the art, a detailed description of the mounting structure will beomitted.

The torsional spring 220 is provided to be disposed at the empty space600 formed inside of the projected portion 110 a of the stator part 110of the generator 100. A portion of the stator part 110 is projectedfurther toward the engine 500 than the rotor part 120 and forms aprojected portion 110 a. Therefore, the empty space 600 is formed at thecentral part of the projected portion 110 a, and the torsional spring220 is disposed at the empty space 600. Therefore, the length of thetransmission can be shortened.

According to the present invention, since the plate of the torsionaldamper has a double-bent shape and the torsional spring is disposed atthe vacant space formed inside of the projected portion of the statorpart of the generator, a length of the transmission can be shortened.

While this invention has been described in connection with what ispresently considered to be a practical exemplary embodiment, it is to beunderstood that the invention is not limited to the disclosedembodiment, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the spirit andscope of the appended claims.

1. An automatic transmission of a hybrid vehicle, comprising: a flywheelconnected to an engine; a generator having a stator part and a rotorpart installed inside of the stator part; an input shaft connected withthe rotor part of the generator; a hub coupled to an end of the inputshaft; and a torsional damper connecting the flywheel with the hub,wherein the torsional damper comprises: a torsional spring mounted tothe hub; and a plate mounted to the torsional spring and the flywheel,an end of the stator part is projected further toward the engine than anend of the rotor part and forms a projected portion, a vacant space isformed inside the projected portion, the plate is formed to be bent suchthat a mounting part mounted to the torsional spring is nearer to thegenerator than a mounting part mounted to the flywheel, and at least apart of the torsional spring is disposed in the vacant part.
 2. Theautomatic transmission of a hybrid vehicle of claim 1, wherein the platecomprises: a first perpendicular part that is perpendicular to the inputshaft and is mounted to the flywheel; a second perpendicular part thatis perpendicular to the input shaft and is mounted to the torsionalspring; and a slope part connecting the first perpendicular part withthe second perpendicular part, wherein the first perpendicular part isnearer to the engine than the second perpendicular part.
 3. Theautomatic transmission of a hybrid vehicle of claim 2, furthercomprising: a first delivery shaft parallel with the input shaft; and asecond delivery shaft parallel with the first delivery shaft anddirectly connected with a differential gear, wherein a rotational torqueof the input shaft is delivered to the differential gear through thefirst delivery shaft and the second delivery shaft.